USB 1& 2 Help Required

System Athlon 1200 Asus A7V motherboard.WinME.I have four USB1 ports that appear to be powered via PCI from the motherboard at rear and two others at the top rear next to the keyboard and mouse ports. I wish to add a new Siig USB2 and Firewire PCI card. My questions are these,will I need to disable the USB1 card by removing it or can I have both cards connected and working? I aim to replace my current Firewire card with the Siig. If I have to disable USB1, how do I do this? The Siig comes with USB2 drivers. Thanks in advance. Chalkie.